1.
Štikonas A. A survey on stationary problems, Green’s functions and spectrum of Sturm–Liouville problem with nonlocal boundary conditions. NAMC [Internet]. 2014 Oct. 30 [cited 2025 Jul. 28];19(3):301-34. Available from: https://www.zurnalai.vu.lt/nonlinear-analysis/article/view/13638